# Full text of "The manufacture and properties of iron and steel"

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72                           METALLURGY OF IRON AND STEEL.
many cubic feet of air, which will burn just so many pounds- of coke, so that any reduction in the amount of fuel per ton will be followed by a corresponding increase in the tons of iron made, and it follows that the furnace will burn the same quantity of coke in one hour or in one minute as before. Laying aside all question of a better carbon ratio, the engine will deliver the same
TABLE II-B.
Method of Calculating the Composition and Value of Tunnel Head
Gas.
Assumptions for ton of pig iron.	Car.bon ; Ibs.	Oxygen ;i Ibs.
Coke 2000 Ibs., 87 per cent, carbon      .......................	1740 113
Stone, 1000 Ibs., 94 per cent. CaOOg ; (only 002 enters gas) ..... Ore— FeaOa ; one ton pig— 95 per cent. Fe=2128 Ibs. Fe ..........		301 912 49
Moisture, 3.6 grains per cu. ft. ; 108,000 cu. ft. air=55.71bs. H20. Total carbon in coke and stone ....................... ,. .........
1853 84 1769

1262

C as OOo— 1769X*r— 655 Ibs.— 2402 Ibs. C02 .........................	655 1114 1769	1747 1485 3232 1202 197C
C as CO— 1769Xi|— 1114 Ibs —2599 Ibs. CO .......................
Total carbon and oxygen in COj and CO ..... . ..................

Oxygen derived from, blast .............................. . .....

Tolume ; cu. ft.	Per cent.
Volume of oxygen from air, 1970-5-0 089 .........        .......... .	22,130 83,760 1590 85,350 19,510 33,320 420  ' 2110 140,710 107,900 120,850 157,600
Nitrogen with, this oxygen, 22,iiiOX3.785 .........................
Assuming 0.3 per cent, free oxygen in gas, the nitrogen with 1
Total nitrogen in gas .............................................. C02 in gas=2402-r-0.123 ..........................................		60.6 13.9 23.7 0.3 1.5 100.0
CO in gas— 2699-^0.078 ...............................................
Free oxygen, assumed to be 0.3 per cent ................ . .........
Free hydrogen, assumed to be 1.5 per cent ......... ..............
Total gas per ton of iron .................................... .....
Air per ton of iron, 85,350-i-0.79i (air— 79.1 per cent. N) ........
Air per ton of coke, 107,900X§§\$§ ..................................
Gas per ton of coke, 140,710X3\$33 ..................................

B. T. U.
Calorific value of gas per cu. ft ................................	86.2 13,585,000 1,599,600 15,184,600 28,538,000 2,924,600 31,462,600 48.26
Calorific value of gas per ton of coke, i57, 600X86.2 .............
Sensible heat of gas from one ton of coke, gas = 500° F. ; 1 157,600X0.0203X500 ............................. . . ............ . . j
Total energy in gas at 500° F ......................................
Calorific value of one ton of coke ............................
Sensible heat per ton of coke, blast=1100° F. ; 120.850X0.022X 1 1100 ........ 7. .................... .. .; .......... \$
Total heat entering furnace per ton of coke. ....... . . . . ........
Per cent, of energy in gas, 15,184,600^31,462,600 ...................